Brake-operating means



K. E, LYMAN BRAKE OPERATING MEANS Filed June 2, 1927 INVENTOR KENNETHE.-LYMAN v I ATTORNEY structural details, will be apparent from the"Patented Oct. 8 1929 which is operated by the usual driver-com;

KENNET E.LYMA1\T, or CHICAGO, ILLINOIS, ASIGNGR '10 BENnIx'BRAKE'COMIEANY,

OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS nRAkE-orma'rme MEANSApplication filed June i927; ser l This invention relates to brakes andis illustrated as embodied in novel operating mech anism for afront-wheel automobile brake.

An object of the invention is to provide simple adjusting means,preferably of an automatic character, for compensating for wear of thebrake.

The illustrated arrangement includes a" novel eccentric thrust devicebetween two levers or other operating members, one. of

which operates the brake and the other of trolled connections.

The eccentric device can be turned to' compensate for. wear of thebrake. Iprefer to provide a stop,- or equivalent means, arrangedautomatically to turn the 'eccentriedevice when the brake wears enoughto permit excessive movement of the operating mechanism.

Variousfeatures of novelty relate to the} form of the eccentric device,and to its mounting and its adjustment. All of these various features,and including desirable and novel I following description of theillustrative em- .bodiments shown in the ciated parts;

accompanying drawing, in which;

-Figure l '.-1sa partial vertical sectionthrough one front brake andthrough asso:

Figure 2 is a section on the line 22 of I Figure 1, showing the noveladjusting parts in side elevation;

Figure 3 is a front elevation. of the parts of Figure 2; and" r IFigure4 is a view corresponding to Figure 2, but showing a modificationin which'the adjustment: is made as the brake is released, in-

stead of as .the brake is applied. 1 1 The parts shown in Figure -1include 'a drum 1O rotating with a wheel 12 .ha'ving'fa; hub 14 on thespindle 16 of a knuckle 18 swivelled, by a king-pin or the like, atoneendof an axle 20. The opensicle of drum 10 is .closedby a backing plate22 carried by the knuckle 18. n

The brake proper includes shoes-24 operat- Y ed bymeans such as-a cam 26carried by or integral with a shaft 28 journalled in a provided, withteeth 54' facing .the opposite 1 way from teeth 48, and engaging a sprin"As the adjustments particular embodiments, or otherwise bracket 30secured to the backing plate 22. Shaft 28 is operated by novel meansengaged -by an integral ball 32 on the end of a lever 34 pivoted on theaxle 20 -When the brake is applied, the'center of halP32 is arranged inor immediately adjacentthe swivelling axis of the wheel. v

The novel'adjusting means is' shown as ar- .ranged between two thrustmembers-such as levers 36 and 38. Lever 36 has a .hub portion encirclinga serrated portion-of shaft 28, and clamped to the shaft by means suchas a contracting screw40, thus fixing lever 36' on the 4 shaft.

. Lever38 is formed at its upper end with a v C-shaped open looppartially encircling the hub of lever 36, so that lever 38 may beregarded asloosely mounted on shaft 28. Lever 38 is engaged by the ball32 of lever 34.

Lever 36 hasparalle'l side portions, be-

tween which is pivoted a novel eccentric thrust device 42, preferablyformed on one or both ends with ratchet teeth 44 engaged by I v a o dingpawl 46" pressed integrally from the side of'the lever. Y

The device 42 is also formed withexternal ratchet teeth-48, and when thewear of the I brake permits excessive inovement of shaft 50which'shift's the device 422 onetoo 'In the arrangement of Figure,';deyice42 pressed hooked stop or pawl 56, so that the adjustment ismade as the brake is released,

instead of during the application of the brake as in Figure-2.-- v H vare made from timeto time,;and since lever 38 engages-the eccentric{device 42 in order to operate lever 36, the levers-are graduallyshifted angularly with respect toieach other, sulficientlyto-compensatefor the wear of the brake. p

.While two illustrative embodiments have I been described in detail, itis not-my intention to limit the scope of the invention tozthose han bythe terms of. the appended claims.

Iclaim:

l. Brake-operating mechanism comprising two members, and-the said other"of which 0 erates the brake, in combination with an eccentric thrustdevice carried by one of said members and in disconnected thrustengagement with the one of which operates the other on one end, and atleast one of said sides hav- .ing a holding pawl part engaging saidteeth. In testimony whereof, Ihavehei'eunto signed my name.

- KENNETH E. LYMAN.

other of said. members, andmeans for automatically turning said deviceto compensate for wear of the brake.

2. Brake-operating mechanism comprising two members, one of whichoperates the other and the said other of which operates the brake, incombination with an eccentric thrust device between said members, and astationary stop arranged to turn the eccentric in case of excessivebrake-applying move- .ment.

3. Brake-operating mechanism compris ing, in combination, a shaft, twolevers on the shaft and one of which is fixed on the shaft and the otherof which is loose, operating means engaging the loose lever, andan.eccentrio thrust device through which the loose lever operates the.fixecl lever.

4. Brake-operating mechanism comprismg, in combination, a-shaft, twolevers on the shaft and one of which is fixed on the shaft and the otherof which isloose, operating means. engaging the loose lever, aneccentric thrust device through which the loose lever operates the fixedlever, and means for auto thrust device through which the loose leveroperates the fixed lever, and a stop arranged to turn the eccentric incase of excessive brake-applying movement of the shaft.

6. Operating mechanism comprising, in

combination, a lever having spaced sides, an

eccentric thrust device pivotally mounted between said sidesQandhavingexternal ratchet teeth, an operating member engaging the thrustdevice'for actuating the lever, and a stop engageable with said teeth to.turn the eccentric device in case of excessive-movement of the lever.

7. Brake-operating mechanism for brake operating shafts comprising, incombination, a lever having spaced sides, an eccentric adjustable thrustdevice pivotally mounted between said sides, and an operating memberengaging the thrust device for actuating the lever.

' 8. Operating mechanism for'brake operating shafts comprising, incombination, a lever having spaced sides, an eccentric adjustable thrustdevice pivotally mounted between said sides, and an operating memberengagin the thrust device for actuatingthe lever,sai

thrust deyice having ratchet teeth at least rat

